Air admittance valve preventing mephitis overflow

ABSTRACT

An air admittance valve preventing mephitis overflow, having a main body with an air entry guide base defining an air entry guide; a pivot support; and a valve seat. A sealing valve group having a sealing valve body that defines a recess; a flexible member; a pivot housing; and a pivot. The valve seat is located about the air entry guide. The pivot is located in the pivot housing and the pivot support, and the pivot is located along, or adjacent to, the center of gravity of the sealing valve body. The flexible member is at least partially located in the recess and abuts the main body; and when the air admittance valve is closed, the sealing valve body abuts the valve seat.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims all benefits accruing under 35 U.S.C. §119 fromTaiwanese Patent Application No. 104200490, filed on Jan. 13, 2015, inthe Taiwanese Intellectual Property Office, disclosure of which isincorporated herein by reference.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to an air admittance valve preventingmephitis (noxious gas) overflow, and particularly relates to the fieldof using an air intake apparatus.

Description of Related Art

According to the prior art air intake pipe structure shown in FIG. 5,which is formed of a pipe body 50, air intake channeling functions areperformed for all kinds of apparatuses via connection of apparatuseswith the pipe body 50. Also in FIG. 6, a structure formed of a pipe body50 and a pipe cover body 60 is shown, wherein a net surface 61 islocated on top of said pipe cover body 60. The pipe cover body 60 coversthe top of the pipe body 50, so that air is introduced into the pipebody 50 through the net surface 61 of the pipe cover body 60. Moreover,although the apparatus coupled through the pipe body 50 performs airintake channeling functions for all kinds of apparatuses.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an embodiment of air admittance valve.

FIG. 2 shows a cross-section, along with other parts, of an embodimentof the main body in an embodiment of the air admittance valve.

FIG. 3 shows a cross-section of an embodiment of an air admittancevalve.

FIG. 4 shows actuation of an embodiment of a valve body in an embodimentof an air admittance valve.

FIG. 5 shows an air intake pipe according to the prior art.

FIG. 6 shows an air intake pipe and pipe cover according to the priorart.

DETAILED DESCRIPTION

It will be appreciated that for simplicity and clarity of illustration,where appropriate, reference numerals have been repeated among thedifferent figures to indicate corresponding or analogous elements. Inaddition, numerous specific details are set forth in order to provide athorough understanding of the embodiments described herein. However, itwill be understood by those of ordinary skill in the art that theembodiments described herein can be practiced without these specificdetails. In other instances, methods, procedures and components have notbeen described in detail so as not to obscure the related relevantfeature being described. Also, the description is not to be consideredas limiting the scope of the embodiments described herein. The drawingsare not necessarily to scale and the proportions of certain parts havebeen exaggerated to better illustrate details and features of thepresent disclosure.

Several definitions that apply throughout this disclosure will now bepresented.

The term “coupled” is defined as coupled, whether directly or indirectlythrough intervening components, and is not necessarily limited tophysical connections. The connection can be such that the objects arepermanently coupled or releasably coupled. The term “outside” refers toa region that is beyond the outermost confines of a physical object. Theterm “inside” indicates that at least a portion of a region is partiallycontained within a boundary formed by the object. The term“substantially” is defined to be essentially conforming to theparticular dimension, shape or other word that substantially modifies,such that the component need not be exact. For example, substantiallycylindrical means that the object resembles a cylinder, but can have oneor more deviations from a true cylinder. The term “comprising,” whenutilized, means “including, but not necessarily limited to”; itspecifically indicates open-ended inclusion or membership in theso-described combination, group, series and the like. The term “vehicle”includes motor vehicles (e.g. motorcycles, cars, trucks, buses), railedvehicles (e.g. trains, trams), watercraft (e.g. ships, boats), aircraftand spacecraft.

The present invention is related to the prior art problems ofinsufficient prevention functionality and sealing instability in airintake pipe structures, and therefore provides an air admittance valvepreventing mephitis overflow. One embodiment provides an air admittancevalve preventing mephitis overflow comprising of a main body 10, anexternal lid body 20, a sealing valve group 30, and a connecting pipebody 40. Plurality of position-fixing lugs 100 can extend from outsidethe main body 10, and an outer connecting part located outside the mainbody's 10 lower side. In some embodiments, an outer connecting part isan external thread. An entry guide base 102 is located inside the mainbody 10. An air entry guide 102A is defined by the entry guide base 102and a blocking protrusion 102B is located at the other side of the entryguide base 102. One or more pivot supports 102C can be located betweenthe blocking protrusion 102B and the air entry guide 102A. In someembodiments, there are two pivot supports 102C. The external lid body 20inner side comprises a side groove 21, and the sealing valve group 30comprises a sealing valve body 31, a valve seat 32, and a flexiblemember 33. A cover body piece 310 is located on a first side of thesealing valve body 31, and a pivot flange and a recess 312 are locatedon a second side of the sealing valve body 31. A pivot 311A is locatedin the pivot housing 311 and the two pivot supports 102C. The frictionbetween the pivot 311A, the pivot housing 311 and/or pivots supports 102can help define the sensitivity of the air admittance valve. The lessthe friction, the less force required to overcome the friction and moreprecise the actuation of the valve can be based upon the other elements(e.g. the flexible member 33). A valve seat 32 is located in the mainbody recess 312. A flexible member 33 is located in the containingrecess. A connecting head 41 is located on the upper side of theconnecting pipe body 40. An inner connecting part 410 is located insideof the connecting head 41. In some embodiments, the inner connectingpart 410 is a locking thread that will correspond with the outerconnecting part 101. A pipe body piece 42 can be located at the lowerpart of the connecting pipe body 40. The external lid body 20 coverspart of the main body 10. In some embodiments, a plurality of the sidegrooves 21, located inside the external lid body 20, abut the pluralityof position-fixing lugs 100 located around the outside of the main body.One or more pivot housings 311 are located on the sealing valve body 31.In some embodiments, the two pivot supports 102C are located on theentry guide base 102. The valve seat 32, located in the main bodyrecess, helps create a seal when abutting the cover body piece 310. Inone embodiment, one end of the flexible member 33 is located inside therecess 312 of the sealing valve body 31, and a second end is restrictedby the blocking protrusion 102B. An outer connecting part 101 is coupledto an inner connecting part 410. When a sufficient minimum pressure dropis transmitted by the pipe body piece, the cover body piece 310 isactuated, so that fresh air is introduced into the air entry guide 102Athrough the gap formed between the main body 10 and the external lidbody 20. In some embodiments, the sufficient minimum pressure drop isabout 0.009 psi (Pounds per Square Inch). In other embodiments, thesufficient minimum pressure drop can be higher (e.g. 0.01 psi up to 3psi and higher). Air is then introduced into the pipe body piece 42 andthe apparatus that is coupled to the pipe body piece 402. When the pipebody piece 402 and the ambient pressure are in balance, or below theminimum pressure drop, the cover body piece 310 abuts the valve seat 32.The flexible member 33, located in the recess 312, biases the cover bodypiece 310 against the valve seat 32, but allows for opening when theminimal pressure drop is present. Thus overflow of mephitis is preventedby effective sealing and the advantages of good prevention functionalityand good sealing stability are obtained.

FIGS. 1 and 2 show exploded views of an embodiment of an air admittancevalve.

A main body 10, in which plurality of position-fixing lugs 100 arelocated circumferentially outside of the main body 10, and an outerconnecting part 101 is located circumferentially around the outside themain body 10. In some embodiments, the outer connecting part 101 is anexternal locking thread. An air entry guide 102A is located at one sideof the entry guide base 102, and a blocking protrusion 102B is locatedat the other side of the entry guide base 102. The two pivot supports102C are located opposite to each other between the blocking protrusion102B and the air entry guide 102A.

In some embodiments, the external lid body 20 comprises plurality ofside grooves 21 that are located inside the external lid body 20. Theexternal lid body 20 is located the main body 10, and the plurality ofposition-fixing lugs 100 are arranged at least partially in the sidegroove 21. In other embodiments, the position-fixing lugs 100 extendfrom the main body 10. In some embodies, there are no position fixinglugs 100, only a passage way to allow air to enter the air entry guide102 is required. In some embodiments, there is no external lid body 20.

In some embodiments, a sealing valve group 30 comprises a sealing valvebody 31, a valve seat 32, and a flexible member 33. A cover body piece310 is located at the first side of the sealing valve body 31 and arecess 312 is defined by the second side of the sealing valve body 31. Apivot 311A passes through the pivot housing 311, which is locatedbetween the cover body piece 310 and the recess 312. The valve seat 32is located in the main body recess. The flexible member 33 is at leastpartially located within the recess 312, and the pivot housing 311 islocated on the sealing valve body 31. Two pivot supports 102C can belocated on the entry guide base 102. The valve seat 32 abuts the coverbody piece 310, when in the closed position. In some embodiments, thevalve seat 32 is partially located in a main body recess. In otherembodiments, the valve seat 32 is not in a recess and secured to themain body 10. The flexible member 33 is located in the recess 312 and,in some embodiments, abuts the blocking protrusion 102B. In someembodiments the blocking protrusion 102B is substantially conicalshaped. When present, the blocking protrusion can be of any shape thatallows it to help keep the flexible member 33 in line with the recess312.

A connecting pipe body 40 comprises a connecting head 41 and a pipe bodypiece 42. In some embodiments, an inner connecting part 410 is locatedinside the pipe wall of the connecting head 41, and/or the innerconnecting part 410 is an internal locking thread.

FIGS. 3 to 4 show an assembled embodiment of an air admittance valve.The external lid body 20 is coupled to the main body 10. The side groove21 is defined by the inside of the external lid body 20 and receives oneof the plurality of position-fixing lugs 100 located around the outsideof the main body 10. A pivot housing 311 is located on the sealing valvebody 31. Two pivot supports 102C are located on the entry guide base102. When closed, the valve seat 32 abuts the cover body piece 310. Afirst end of the flexible member 33 is located in the containing recess312 of the sealing valve body 31, and in some embodiments, the other endis restricted by the blocking protrusion 102B. In other embodiments, theflexible member second end abuts the entry guide base 102. The main body10 is coupled to the connecting pipe body 40. In some embodiments, anouter connecting part 101 will be coupled to an inner connecting part410, located inside the connecting head 41. When a sufficient pressuredrop occurs in the pipe body piece 42, cover body piece 310 will rotateinto an open state, so that air is introduced into the air entry guide102A from the gap formed between the main body 10 and the external lidbody 20. Air will then flow into the pipe body piece 42 and into theapparatus that is coupled with the pipe body piece 42. The flexiblemember 33 biases the cover body piece 310 to abut the valve seat 32 andclose the air entry guide 102A. Thus overflow of mephitis is preventedby effective sealing and the advantages of good prevention functionalityand good sealing stability are obtained.

The rotational nature of the sealing valve group 30 provides forbalancing when used in situations where there is movement of theapparatus. In some embodiments, this balancing is critical to the properfunctioning of the sealing valve group 30. This movement can occur withvehicles. In some embodiments, the pivot 311A is located substantiallyalong the center of gravity of the sealing valve body 31, such that thesealing valve body 31 is balanced about the pivot. This is very usefulin an area in which the apparatus would move. For example, while locatedin a vehicle, such as a recreational vehicle, a bump is hit, and theapparatus is thrusted upwards and back down. During such a movement, themomentum on both sides of the sealing valve body 31 will help preventaccidental opening thus preventing mephitis overflow. The momentum willbe balanced on both sides. This balancing of the sealing valve body 31will also help lessen the amount, if any, openings in response toasymmetrical movements of the apparatus. Also since there is littleopening and closing, there will be less rattling when compared to otherair admittance valves of the prior art. In some embodiments, thevehicles require the valve body 31 to open at very low pressure dropsdue to the design of the plumbing systems. In some embodiments thepressure drop required to open the valve body 31 is 0.008 psi. In someembodiments it can be even lower.

The balancing of the sealing valve body 31 will also allow for theflexible member 33 to more precisely determine the opening pressurerequired for the sealing valve body 31 to actuate. Increasing thestrength of the flexible member, will increase the pressure droprequired to actuate the sealing valve body, and vice versa. Thus onewould be able to easily adjust the pressure drop required by adjustingthe flexible member 33 that is used.

One problem that often can occur is that the adhesion between the valveand the valve seat, and when talking about low pressure conditions, theadhesion can cause difficulty in opening the valve. Thus the materialsof sealing valve body and the valve seat 32 should be of such acombination as to minimize the adhesion between them. In someembodiments, the valve seat 32 is made of silicone with a low durometer.Other materials that provide for a quality seal can also be used.

The embodiments shown and described above are only examples. Even thoughnumerous characteristics and advantages of the present technology havebeen set forth in the foregoing description, together with details ofthe structure and function of the present disclosure, the disclosure isillustrative only, and changes may be made in the detail, including inmatters of shape, size and arrangement of the parts within theprinciples of the present disclosure up to, and including, the fullextent established by the broad general meaning of the terms used in theclaims.

What is claimed is:
 1. An apparatus comprising an air admittance valve, the air admittance valve comprising: a main body comprising an air entry guide base defining an air entry guide, a pivot support, and a valve seat; a sealing valve group comprising a sealing valve body, that defines a recess; a pivot housing; and a pivot; wherein the valve seat is located about the air entry guide; the pivot is located in the pivot housing and the pivot support, and the pivot passes through, or is adjacent to, a center of gravity of the sealing valve body; and when the air admittance valve is closed, the sealing valve body abuts the valve seat.
 2. The apparatus of claim 1, further comprising an external lid body; wherein the external lid body is coupled to the main body.
 3. The apparatus of claim 1, further comprising a connecting pipe body, and the connecting pipe body comprises a connecting head; wherein the connecting head is coupled to the main body.
 4. The apparatus of claim 3, wherein the connecting head comprises a connecting head thread, and the main body comprises a main body thread; and the connecting head thread is engaged with the main body thread.
 5. The apparatus of claim 1, wherein the main body comprises a plurality of lugs, an external lid body defines a plurality of slide grooves, and the plurality of lugs are received within the plurality of slide grooves.
 6. The apparatus of claim 1, wherein the main body defines a main body recess, and the valve seat is located in the main body recess.
 7. The apparatus of claim 1, wherein the air admittance valve will open in response to a pressure, and the pressure is in a range of 0.008 pounds per square inch (psi) to 3 psi.
 8. The apparatus of claim 1, wherein when the air admittance valve is opened, air will flow into an external lid body and through the air entry guide.
 9. A vehicle comprising: an air admittance valve comprising: a main body comprising an air entry guide base defining an air entry guide, a pivot support, and a valve seat; a sealing valve group comprising a sealing valve body, that defines a recess; a pivot housing; and a pivot; wherein the valve seat is located about the air entry guide; the pivot is located in the pivot housing and the pivot support, and the pivot passes through, or is adjacent to, a center of gravity of the sealing valve body; and when the air admittance valve is closed, the sealing valve body abuts the valve seat.
 10. The vehicle of claim 9, further comprising an external lid body; wherein the external lid body is coupled to the main body.
 11. The vehicle of claim 9, further comprising a connecting pipe body, and the connecting pipe body comprises a connecting head; wherein the connecting head is coupled to the main body.
 12. The vehicle of claim 11, wherein the connecting head comprises a connecting head thread, and the main body comprises a main body thread; and the connecting head thread is engaged with the main body thread.
 13. The vehicle of claim 9, wherein the air admittance valve will open in response to a pressure, and the pressure is in a range of 0.008 PSI to 3 PSI.
 14. An apparatus comprising an air admittance valve, the air admittance valve comprising: a main body comprising an air entry guide base defining an air entry guide, a pivot support, and a valve seat; a sealing valve group comprising a sealing valve body, that defines a recess; a pivot housing; and a pivot; wherein the valve seat is located about the air entry guide; the pivot is located in the pivot housing and the pivot support; an axis of rotation of the sealing valve body passes through, or is adjacent to, a center of gravity of the sealing valve body; and when the air admittance valve is closed, the sealing valve body abuts the valve seat. 